A transponder data transmission cable fault detection system and method

Abstract

The present invention provides a transponder data transmission cable fault detection system. The system includes a signal frequency detection unit: for detecting the electromagnetic signal frequency at one end of the outdoor dedicated tail cable connected to the transponder; a voltage detection unit: for detecting the voltage at the cable connection node of the outdoor cable box and / or the output end of the LEU; at least one positioning unit: for detecting and positioning the area where the cable fault occurs. Each positioning unit includes a fault location detection signal generator and a fault location detection signal receiver. The fault location detection signal generator is used to emit a detection signal when the voltage exceeds a set threshold; the fault location detection signal receiver: for receiving the detection signal and judging whether it is normal. The present invention only needs to install corresponding devices at the cable connection nodes; there is no need to rely on other communication cables; it can locate the interval where the transponder data transmission cable fails, providing an accurate guiding basis for the maintenance of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and particularly relates to a transponder data transmission cable fault detection system and method. Background Art

[0002] With the rapid development of high-speed railways in China, higher requirements are put forward for the stability and safety of railway signal systems. The transponder information transmission system is an important signal source for trains. The transponder information transmission system includes ground equipment and on-vehicle equipment. The on-vehicle equipment mainly refers to the transponder communication unit BTM, including a BTM host, a BTM antenna, and an antenna cable; the ground equipment mainly includes passive transponders, active transponders, and a ground electronic unit (LEU). Among them, the active transponder and the LEU are connected through a transponder data transmission cable for data communication.

[0003] The transponder data transmission cable can be divided into an outdoor special tail cable, an outdoor special trunk cable, and an indoor special cable according to different installation locations. The active transponder is installed on the roadbed between two rails. One end of the special outdoor tail cable is connected to the transponder, and the other end passes under one side of the rail and then accesses the outdoor cable box beside the rail. Then the outdoor special trunk cable is led out from the outdoor cable box and connected to the lightning protection unit. The indoor special cable is then led out from the lightning protection unit and finally connected to the LEU. The specific connection relationship is as Figure 1 shown.

[0004] Whether it is a passive transponder or an active transponder, their working principles are the same. When a train passes above the ground transponder, after the transponder receives the electromagnetic energy signal with a fixed frequency of 27.095 MHz sent by the BTM antenna, the transponder converts the energy into working power supply, starts the electronic circuit to work, and sends the up and down messages through the transponder data transmission cable until the electromagnetic energy disappears.

[0005] Since the transponder data transmission cable has multiple connection nodes, it is very difficult to locate the fault point once a fault occurs. Therefore, it is very important to detect the state of the transponder data transmission cable to determine whether the cable is in a normal state, or to conveniently locate the fault point when a fault occurs in the transponder data transmission cable.

[0006] The invention patent with the application number 201210328936.8 discloses a transponder cable detection system and method for detecting the cable status between a ground electronic unit and a transponder. It includes a detection module located at the transponder end, which is used to obtain energy from the transponder cable, generate a cable detection signal and send it to the detection and processing module through the transponder cable; a detection and processing module located at the ground electronic unit end, which is used to extract the cable detection signal from the transponder cable, detect the status of the transponder cable according to the cable detection signal, and provide the detection result to the subsequent device. The invention can accurately detect the status of transponder cables within 3 km and longer than 3 km. The detection accuracy is independent of the length of the transponder cable, which can meet the longest application requirements, and there is no need to change the original performance of the transponder cable. It realizes the purpose of highly reliable transponder cable status detection with a small cost, enabling users to detect transponder cable anomalies early and improve the train operation efficiency. However, the invention cannot locate the cable fault point and requires structural improvement of existing active transponders or LEUs, resulting in high costs, large engineering quantities, and great implementation difficulties. Summary of the Invention

[0007] To solve at least one of the above technical problems, the present invention provides a transponder data transmission cable fault detection system and method.

[0008] The first aspect of the present invention provides a transponder data transmission cable fault detection system, including:

[0009] A signal frequency detection unit: used to detect the electromagnetic signal frequency at one end of the outdoor dedicated tail cable connected to the transponder;

[0010] A voltage detection unit: used to detect the voltage at the cable connection node of the outdoor cable box and / or the output end of the LEU;

[0011] At least one positioning unit: used to detect and locate the area where the cable fault occurs. Each positioning unit includes a fault location detection signal generator and a fault location detection signal receiver. The fault location detection signal generator is used to send a detection signal when the voltage exceeds the set threshold; the fault location detection signal receiver: used to receive the detection signal and judge whether it is normal.

[0012] Preferably, the signal frequency detection unit includes a signal frequency detection sensor installed at one end of the outdoor dedicated tail cable connected to the transponder.

[0013] Preferably, in any of the above solutions, when the signal frequency detection sensor detects a signal outside the frequency range of 27.095 MHz - 5 KHz to 27.095 MHz + 5 KHz, the reception fault indicator light on the signal frequency detection unit lights up; when detecting a signal frequency outside the frequency range of 4.234 MHz - 300 KHz to 4.234 MHz + 300 KHz, the transmission fault indicator light on the signal frequency detection unit lights up.

[0014] Preferably, in any of the above solutions, the voltage detection unit includes a first voltage detection subunit and a second voltage detection subunit.

[0015] Preferably, in any of the above solutions, the first voltage detection subunit includes a first voltage sensor, which is installed at the cable connection node in the outdoor cable box and is used to detect the voltage value at the cable connection node in the outdoor cable box. When the first voltage sensor detects a signal outside the voltage range of 10 V to 12 V, the first voltage fault indicator light on the first voltage detection subunit lights up.

[0016] Preferably, in any of the above solutions, the second voltage detection subunit includes a second voltage sensor, which is installed at the LEU output end connected to the transponder and is used to detect the voltage value at the LEU output end. When the second voltage sensor detects a signal outside the voltage range of 14 V to 18 V, the second voltage fault indicator light on the second voltage detection subunit lights up.

[0017] Preferably, in any of the above solutions, the positioning unit includes at least a first positioning subunit, a second positioning subunit, and a third positioning subunit.

[0018] Preferably, in any of the above solutions, the first positioning subunit is installed at the cable connection node in the outdoor cable box and is connected to the first voltage detection subunit, and is used to receive the voltage value detected by the first voltage sensor. When the first voltage sensor detects a signal outside the voltage range of 10 V to 12 V, the fault positioning detection signal generator in the first positioning subunit emits a detection signal with a first fixed frequency.

[0019] Preferably, in any of the above solutions, the second positioning subunit is installed at the LEU output end and is connected to the second voltage detection subunit, and is used to receive the voltage value detected by the second voltage sensor. When the second voltage sensor detects a signal outside the voltage range of 14 V to 18 V, the fault positioning detection signal generator in the second positioning subunit emits a detection signal with a second fixed frequency.

[0020] Preferably, in any of the above solutions, the third positioning subunit is installed at the connection node of the lightning protection unit. The fault location detection signal receiver of the third positioning subunit receives the detection signal of the first fixed frequency or the detection signal of the second fixed frequency sent by the fault location detection signal generator in the first positioning subunit or the second positioning subunit, and after amplifying the detection signal, sends it out by the fault location detection signal generator of the third positioning subunit.

[0021] Preferably, in any of the above solutions, the fault location detection signal receiver in the first positioning subunit or the second positioning subunit is used to receive the detection signal sent by the fault location detection signal generator of the third positioning subunit.

[0022] Preferably, in any of the above solutions, the first positioning subunit, the second positioning subunit, and the third positioning subunit are all provided with a signal emission indicator light and a signal reception indicator light. The signal emission indicator light lights up after the positioning subunit sends out the detection signal of the fixed frequency; the signal reception indicator light of the first positioning subunit lights up after receiving the detection signal of the second fixed frequency, the signal reception indicator light of the second positioning subunit lights up after receiving the detection signal of the first fixed frequency, and the signal reception indicator light of the third positioning subunit lights up after receiving the detection signal of the first / second fixed frequency.

[0023] Preferably, in any of the above solutions, the first positioning subunit and the second positioning subunit are further provided with buttons for manually controlling the fault location detection signal generator to send out the detection signal of the fixed frequency.

[0024] The second aspect of the present invention provides a method for detecting faults in a transponder data transmission cable, which is applicable to the transponder data transmission cable fault detection system, and includes:

[0025] Step 1: Collect the magnetic field intensity at one end of the outdoor dedicated tail cable connected to the transponder.

[0026] Step 2: Collect the output voltage at the outdoor cable box and the LEU.

[0027] Step 3: When it is determined that the voltage exceeds the set threshold range, start the fault location detection signal generator in the positioning subunit at the same position of the abnormal voltage to emit a detection signal of a fixed frequency.

[0028] Step 4: The fault location detection signal receiver in the adjacent positioning subunit receives the detection signal of the fixed frequency.

[0029] Step 5: Locate the section where the transponder data transmission cable fails according to the signal indicator light.

[0030] Preferably, step 4 further includes that after the fault location detection signal receiver of the third positioning subunit receives the detection signal of the fixed frequency, the detection signal is amplified and then sent out by the fault location detection signal generator of the third positioning subunit.

[0031] In any of the above solutions, preferably, in step 5, if the receiving fault indicator light on the signal frequency detection unit is on, it is determined that the BTM antenna transmits an energy signal fault; if the transmitting fault indicator light on the signal frequency detection unit is on, it is determined that the transponder transmits an uplink message signal frequency fault.

[0032] In any of the above solutions, preferably, in step 5, if it is determined that there is no fault in the cable between the outdoor cable box and the output end of the LEU according to the signal indicator light, it is determined that the outdoor special tail cable is faulty.

[0033] The transponder data transmission cable fault detection system and method of the present invention have the following beneficial effects:

[0034] There is no need to improve the structure of the existing transponder or LEU device. Only corresponding devices need to be installed at the cable connection nodes, with small difficulty and small engineering quantity;

[0035] There is no need to rely on other communication cables to prevent the influence of other communication cable faults on the use of the fault detection system;

[0036] The section where the transponder data transmission cable fails can be located, providing an accurate guiding basis for cable maintenance;

[0037] The section where the transponder data transmission cable fails is judged by the on and off of the signal lamp, with intuitive display and simple judgment method, and the operation can be completed without professional engineering and technical personnel. Description of the Drawings

[0038] Figure 1 It is a schematic diagram of the connection of the transponder data transmission cable.

[0039] Figure 2 It is a schematic structural diagram of a preferred embodiment of the transponder data transmission cable fault detection system according to the present invention.

[0040] Figure 3 As shown in the embodiment of the transponder data transmission cable fault detection system according to the present invention Figure 1 It is a schematic installation position diagram of the shown embodiment.

[0041] Figure 4 It is a schematic flow diagram of a preferred embodiment of the transponder data transmission cable fault detection method according to the present invention. Detailed Embodiments

[0042] To better understand the present invention, the present invention will be described in detail below in conjunction with specific embodiments.

[0043] Embodiment 1

[0044] As Figure 2 and Figure 3 shown, a transponder data transmission cable fault detection system includes:

[0045] A signal frequency detection unit 10: for detecting the electromagnetic signal frequency at one end of the outdoor dedicated tail cable 01 connected to the transponder;

[0046] A voltage detection unit: for detecting the voltage at the cable connection node of the outdoor cable box and / or the output end of the LEU;

[0047] At least one positioning unit: for detecting and positioning the area where the cable fault occurs. Each positioning unit includes a fault positioning detection signal generator and a fault positioning detection signal receiver. The fault positioning detection signal generator is used to send a detection signal when the voltage exceeds a set threshold; the fault positioning detection signal receiver: for receiving the detection signal and judging whether it is normal.

[0048] As Figure 4 shown, a transponder data transmission cable fault detection method applicable to the transponder data transmission cable fault detection system includes:

[0049] Step 1: Collect the magnetic field intensity at one end of the outdoor dedicated tail cable connected to the transponder;

[0050] Step 2: Collect the outdoor cable box and the LEU output voltage;

[0051] Step 3: When it is judged that the voltage exceeds the set threshold range, start the fault positioning detection signal generator in the positioning subunit at the same position of the abnormal voltage to emit a detection signal with a fixed frequency;

[0052] Step 4: The fault positioning detection signal receiver in the adjacent positioning subunit receives the detection signal with the fixed frequency;

[0053] Step 5: Locate the section where the transponder data transmission cable fails according to the signal indicator light.

[0054] Preferably, in this embodiment, the signal frequency detection unit 10 includes a signal frequency detection sensor, which is installed at one end of the outdoor dedicated tail cable 01 connected to the transponder. When the signal frequency detection sensor detects a signal outside the frequency range of 27.095 MHz - 5 KHz to 27.095 MHz + 5 KHz, the reception fault indicator light on the signal frequency detection unit 10 lights up; when it detects a signal frequency outside the frequency range of 4.234 MHz - 300 KHz to 4.234 MHz + 300 KHz, the transmission fault indicator light on the signal frequency detection unit 10 lights up.

[0055] The transponder receives the energy signal of 27.095 MHz ± 5 KHz emitted by the BTM antenna wirelessly and transmits the uplink message signal at a frequency of 4.234 MHz ± 282.24 KHz. Therefore, a signal frequency detection sensor is used to detect the signal frequency at one end of the outdoor dedicated tail cable 01 connected to the transponder to check whether there is a fault in the BTM antenna transmitting signal or the transponder transmitting the uplink message signal, and the corresponding indicator light lights up when a fault occurs to visually display the occurrence of the fault.

[0056] After excluding the fault in the BTM antenna transmitting signal or the transponder transmitting the uplink message signal, it is determined whether the cable is faulty. The C interface between the LEU and the transponder transmits a baseband differential binary phase modulation signal of 564.48 kb / s, that is, a signal in which DBPL (square wave) and an 8.8 kHz sine wave are superimposed. Through actual measurement, the reference voltage under normal conditions is: the LEU output voltage is 14 V - 18 V, and the voltage at the cable connection node in the outdoor cable box is 10 V - 12 V.

[0057] Preferably, in this embodiment, the voltage detection unit includes a first voltage detection subunit 21 and a second voltage detection subunit 22. The first voltage detection subunit 21 includes a first voltage sensor, which is installed at the cable connection node in the outdoor cable box and is used to detect the voltage value at the cable connection node in the outdoor cable box. When the first voltage sensor detects a signal outside the voltage range of 10 V - 12 V, the first voltage fault indicator light of the first voltage detection subunit lights up, indicating that the voltage at the cable connection node in the outdoor cable box is abnormal. The second voltage detection subunit 22 includes a second voltage sensor, which is installed at the LEU output end connected to the transponder and is used to detect the voltage value at the LEU output end. When the second voltage sensor detects a signal outside the voltage range of 14 V - 18 V, the second voltage fault indicator light of the second voltage detection subunit lights up, indicating that the voltage at the LEU output end is abnormal. When the voltage is abnormal, the positioning unit starts to work to determine the section where the cable fails.

[0058] Preferably, in this embodiment, the positioning unit includes a first positioning subunit 31, a second positioning subunit 32, and a third positioning subunit 33. The first positioning subunit 31 is installed at the cable connection node in the outdoor cable box and is connected to the first voltage detection subunit 21, and is used to receive the voltage value detected by the first voltage sensor. When the first voltage sensor detects a signal outside the voltage range of 10V to 12V, the fault location detection signal generator 311 in the first positioning subunit 31 emits a detection signal with a first fixed frequency. The second positioning subunit 32 is installed at the output end of the LEU and is connected to the second voltage detection subunit 22, and is used to receive the voltage value detected by the second voltage sensor. When the second voltage sensor detects a signal outside the voltage range of 14V to 18V, the fault location detection signal generator 321 in the second positioning subunit 32 emits a detection signal with a second fixed frequency. The third positioning subunit 33 is installed at the lightning protection unit connection node. The fault location detection signal receiver 332 of the third positioning subunit 33 receives the first fixed frequency detection signal or the second fixed frequency detection signal emitted by the fault location detection signal generator in the first positioning subunit 31 or the second positioning subunit 32, and after amplifying the detection signal, emits it by the fault location detection signal generator 331 of the third positioning subunit 33. The fault location detection signal receiver in the first positioning subunit 31 or the second positioning subunit 32 is used to receive the detection signal emitted by the fault location detection signal generator 331 of the third positioning subunit 33. The first positioning subunit 31, the second positioning subunit 32, and the third positioning subunit 33 are all provided with a signal emission indicator light and a signal reception indicator light. The signal emission indicator light lights up after the positioning subunit emits the detection signal with the fixed frequency. The signal reception indicator light of the first positioning subunit 31 lights up after receiving the detection signal with the second fixed frequency. The signal reception indicator light of the second positioning subunit 32 lights up after receiving the detection signal with the first fixed frequency. The signal reception indicator light of the third positioning subunit 33 lights up after receiving the first / second fixed frequency detection signal.

[0059] Step 4 further includes that after the fault location detection signal receiver of the third positioning subunit receives the detection signal of the fixed frequency, the detection signal is amplified and then sent out by the fault location detection signal generator of the third positioning subunit. In Step 5, if the receiving fault indicator light on the signal frequency detection unit is on, it is determined that the BTM antenna transmits an energy signal fault; if the transmitting fault indicator light on the signal frequency detection unit is on, it is determined that the transponder transmits an uplink message signal frequency fault. In Step 5, if it is determined that there is no fault in the cable between the outdoor cable box and the LEU output terminal according to the signal indicator light, it is determined that the outdoor special tail cable is faulty. Specifically:

[0060] (1) The first case: In Step 3, when the first voltage sensor detects a signal outside the voltage range of 10V to 12V, the fault location detection signal generator 311 in the first positioning subunit 31 sends out a detection signal of a first fixed frequency, and the signal transmission indicator light in the first positioning subunit 31 lights up, indicating that the detection signal of the first fixed frequency is successfully transmitted. The detection signal of the first fixed frequency propagates along the cable. In Step 4, the fault location detection signal receiver 332 in the third positioning subunit 33 receives the detection signal of the first fixed frequency sent out by the fault location detection signal generator in the first positioning subunit 31, and the signal reception indicator light in the third positioning subunit 33 lights up, indicating that the detection signal of the first fixed frequency is successfully received. Then, after amplifying the detection signal of the first fixed frequency, it is sent out by the fault location detection signal generator 331 of the third positioning subunit 33, and the signal transmission indicator light in the third positioning subunit 33 lights up, indicating that the third positioning subunit 33 successfully amplifies and transmits the detection signal of the first fixed frequency. The detection signal of the first fixed frequency transmitted by the third positioning subunit 33 continues to propagate along the cable; the fault location detection signal receiver 322 in the second positioning subunit 32 receives the detection signal of the first fixed frequency sent out by the fault location detection signal generator in the third positioning subunit 33, and the signal reception indicator light in the second positioning subunit 32 lights up, indicating that the detection signal of the first fixed frequency is successfully received. In Step 5, according to the on / off conditions of different indicator lights, the section where the transponder data transmission cable fails is located, as shown in Table 1 specifically. In the table, 6 ○ are used to represent the indicator lights, which respectively represent the signal transmission indicator light and the signal reception indicator light of the first positioning subunit 31, the signal transmission indicator light and the signal reception indicator light of the second positioning subunit 32, and the signal transmission indicator light and the signal reception indicator light of the third positioning subunit 33 from left to right. ○ represents the light off, and ● represents the light on.

[0061] (2) Second case: In step 3, when the second voltage sensor detects a signal outside the voltage range of 14V to 18V, the fault location detection signal generator 321 in the second positioning subunit 32 emits a detection signal with a second fixed frequency, and the signal emission indicator light in the second positioning subunit 32 lights up, indicating that the detection signal with the second fixed frequency is successfully emitted. The detection signal with the second fixed frequency propagates along the cable. In step 4, the fault location detection signal receiver 332 in the third positioning subunit 33 receives the detection signal with the second fixed frequency emitted by the fault location detection signal generator in the second positioning subunit 32, and the signal reception indicator light in the third positioning subunit 33 lights up, indicating that the detection signal with the second fixed frequency is successfully received. Then, after amplifying the detection signal with the second fixed frequency, it is emitted by the fault location detection signal generator 331 of the third positioning subunit 33, and the signal emission indicator light in the third positioning subunit 33 lights up, indicating that the third positioning subunit 33 successfully amplifies and emits the detection signal with the second fixed frequency. The detection signal with the second fixed frequency emitted by the third positioning subunit 33 continues to propagate along the cable; the fault location detection signal receiver 312 in the first positioning subunit 31 receives the detection signal with the second fixed frequency emitted by the fault location detection signal generator in the third positioning subunit 33, and the signal reception indicator light in the first positioning subunit 31 lights up, indicating that the detection signal with the second fixed frequency is successfully received. In step 5, according to the on / off conditions of different indicator lights, the section where the positioning transponder data transmission cable fails is located, as shown in Table 1 specifically.

[0062] (3) Third case: In step 3, when the first voltage sensor detects a signal outside the voltage range of 10V to 12V, the fault location detection signal generator 311 in the first positioning subunit 31 emits a detection signal with a first fixed frequency, and the signal emission indicator light in the first positioning subunit 31 lights up, indicating that the detection signal with the first fixed frequency is successfully emitted. The detection signal with the first fixed frequency propagates along the cable. At the same time, when the second voltage sensor detects a signal outside the voltage range of 14V to 18V, the fault location detection signal generator 321 in the second positioning subunit 32 emits a detection signal with a second fixed frequency, and the signal emission indicator light in the second positioning subunit 32 lights up, indicating that the detection signal with the second fixed frequency is successfully emitted. The detection signal with the second fixed frequency propagates along the cable. In step 4, the fault location detection signal receiver 332 in the third positioning subunit 33 receives the detection signal with the first fixed frequency emitted by the fault location detection signal generator in the first positioning subunit 31, and the signal reception indicator light in the third positioning subunit 33 lights up, indicating that the detection signal with the first fixed frequency is successfully received. Then, after amplifying the detection signal with the first fixed frequency, it is emitted by the fault location detection signal generator 331 of the third positioning subunit 33, and the signal emission indicator light in the third positioning subunit 33 lights up, indicating that the third positioning subunit 33 successfully amplifies and emits the detection signal with the first fixed frequency. The detection signal with the first fixed frequency emitted by the third positioning subunit 33 continues to propagate along the cable; the fault location detection signal receiver 322 in the second positioning subunit 32 receives the detection signal with the first fixed frequency emitted by the fault location detection signal generator in the third positioning subunit 33, and the signal reception indicator light in the second positioning subunit 32 lights up, indicating that the detection signal with the first fixed frequency is successfully received. At the same time, the fault location detection signal receiver 332 in the third positioning subunit 33 receives the detection signal with the second fixed frequency emitted by the fault location detection signal generator in the second positioning subunit 32, and the signal reception indicator light in the third positioning subunit 33 lights up, indicating that the detection signal with the second fixed frequency is successfully received. Then, after amplifying the detection signal with the second fixed frequency, it is emitted by the fault location detection signal generator 331 of the third positioning subunit 33, and the signal emission indicator light in the third positioning subunit 33 lights up, indicating that the third positioning subunit 33 successfully amplifies and emits the detection signal with the second fixed frequency. The detection signal with the second fixed frequency emitted by the third positioning subunit 33 continues to propagate along the cable; the fault location detection signal receiver 312 in the first positioning subunit 31 receives the detection signal with the second fixed frequency emitted by the fault location detection signal generator in the third positioning subunit 33, and the signal reception indicator light in the first positioning subunit 31 lights up, indicating that the detection signal with the second fixed frequency is successfully received.In step 5, according to the lighting and extinguishing conditions of different indicator lights, the section where the transponder data transmission cable fails is located, as shown in Table 1 specifically.

[0063]

[0064] Embodiment 2

[0065] For the convenience of operation, preferably in this embodiment, the first positioning subunit 31 and the second positioning subunit 32 are also provided with buttons for manually controlling the fault location detection signal generator to emit the detection signal of the fixed frequency.

[0066] When the lighting condition of ●○●●●○ shown in Table 1 in the above embodiment occurs, it is impossible to specifically judge whether the outdoor dedicated trunk cable fails or the indoor dedicated cable fails. At this time, only need to manually control the fault location detection signal generator of the first positioning subunit 31 to emit the detection signal of the first fixed frequency, or control the fault location detection signal generator of the second positioning subunit 32 to emit the detection signal of the second fixed frequency, then the section position where the cable fault occurs can be accurately located, and the specific judgment is shown in "the first situation" and "the second situation" in Table 1.

[0067] Embodiment 3

[0068] An electromagnetic coil and an energy storage unit are arranged in the signal frequency detection unit. When the train passes by the transponder, the electromagnetic coil receives energy and stores it in the energy storage unit to supply power for the electronic devices in the signal frequency detection unit.

[0069] A solar panel and a storage battery are arranged at the outdoor cable box for storing energy in the storage battery through solar energy and then supplying power for the first voltage detection subunit 21 and the first positioning subunit 31 installed at the outdoor cable box.

[0070] The second voltage detection subunit 22, the second positioning subunit 32 and the third positioning subunit 33 can directly use the indoor power supply.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the foregoing embodiments have described the present invention in detail, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features, and these replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present invention.

Claims

1. A transponder data transmission cable fault detection system, characterized in that: Including: A signal frequency detection unit: used to detect the electromagnetic signal frequency at one end of the outdoor dedicated tail cable connecting the transponder; A voltage detection unit: used to detect the voltage at the cable connection node of the outdoor cable box and / or the output end of the LEU; At least one positioning unit: used to detect and locate the area where the cable fault occurs. Each positioning unit includes a fault location detection signal generator and a fault location detection signal receiver. The fault location detection signal generator is used to send a detection signal when the voltage exceeds the set threshold; the fault location detection signal receiver: used to receive the detection signal and judge whether it is normal; The voltage detection unit includes a first voltage detection sub-unit and a second voltage detection sub-unit. The first voltage detection sub-unit includes a first voltage sensor, and the first voltage sensor is installed at the cable connection node inside the outdoor cable box to detect the voltage value at the cable connection node inside the outdoor cable box. When the first voltage sensor detects a signal outside the voltage range of 10V to 12V, the first voltage fault indicator light of the first voltage detection sub-unit lights up. The second voltage detection sub-unit includes a second voltage sensor, and the second voltage sensor is installed at the output end of the LEU connected to the transponder to detect the voltage value at the output end of the LEU. When the second voltage sensor detects a signal outside the voltage range of 14V to 18V, the second voltage fault indicator light of the second voltage detection sub-unit lights up; The positioning unit includes at least a first positioning sub-unit, a second positioning sub-unit, and a third positioning sub-unit; The first positioning sub-unit is installed at the cable connection node inside the outdoor cable box and is connected to the first voltage detection sub-unit, and is used to receive the voltage value detected by the first voltage sensor. When the first voltage sensor detects a signal outside the voltage range of 10V to 12V, the fault location detection signal generator inside the first positioning sub-unit sends a detection signal with a first fixed frequency; The second positioning sub-unit is installed at the output end of the LEU and is connected to the second voltage detection sub-unit, and is used to receive the voltage value detected by the second voltage sensor. When the second voltage sensor detects a signal outside the voltage range of 14V to 18V, the fault location detection signal generator inside the second positioning sub-unit sends a detection signal with a second fixed frequency; The third positioning sub-unit is installed at the lightning protection unit connection node. The fault location detection signal receiver of the third positioning sub-unit receives the first fixed frequency detection signal or the second fixed frequency detection signal sent by the fault location detection signal generator inside the first positioning sub-unit or the second positioning sub-unit, and after amplifying the detection signal, it is sent by the fault location detection signal generator of the third positioning sub-unit. The fault location detection signal receiver inside the first positioning sub-unit or the second positioning sub-unit is used to receive the detection signal sent by the fault location detection signal generator of the third positioning sub-unit.

2. The transponder data transmission cable fault detection system according to claim 1, characterized in that: The signal frequency detection unit includes a signal frequency detection sensor, which is installed at one end of the outdoor dedicated tail cable connected to the transponder. When the signal frequency detection sensor detects a signal outside the frequency range of 27.095 MHz - 5 KHz to 27.095 MHz + 5 KHz, the receive fault indicator light on the signal frequency detection unit lights up; when it detects a signal frequency outside the frequency range of 4.234 MHz - 300 KHz to 4.234 MHz + 300 KHz, the transmit fault indicator light on the signal frequency detection unit lights up.

3. The transponder data transmission cable fault detection system according to claim 2, wherein: The first positioning sub-unit, the second positioning sub-unit, and the third positioning sub-unit are all provided with a signal transmission indicator light and a signal reception indicator light. The signal transmission indicator light lights up after the positioning sub-unit emits the detection signal of the fixed frequency; the signal reception indicator light of the first positioning sub-unit lights up after receiving the detection signal of the second fixed frequency, the signal reception indicator light of the second positioning sub-unit lights up after receiving the detection signal of the first fixed frequency, and the signal reception indicator light of the third positioning sub-unit lights up after receiving the detection signal of the first / second fixed frequency.

4. The transponder data transmission cable fault detection system according to claim 3, characterized in that: The first positioning sub-unit and the second positioning sub-unit are also provided with buttons for manually controlling the fault location detection signal generator to emit the detection signal of the fixed frequency.

5. A method for detecting faults in a transponder data transmission cable, characterized in that: Applicable to the transponder data transmission cable fault detection system according to any one of claims 1-4, comprising: Step 1: Collect the magnetic field intensity at one end of the outdoor dedicated tail cable connected to the transponder. Step 2: Collect the output voltage at the outdoor cable box and at the LEU. Step 3: When it is determined that the voltage exceeds the set threshold range, start the fault location detection signal generator in the positioning sub-unit at the same position of the abnormal voltage to emit a detection signal of a fixed frequency. Step 4: The fault location detection signal receiver in the positioning sub-unit at the adjacent position receives the detection signal of the fixed frequency. Step 5: Locate the section where the transponder data transmission cable fails according to the signal indicator lights.

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